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Displaying 43426 - 43450 of 143727

Mechanically Compliant Grating Reflectors for Optomechanics

February 10, 2012
Author(s)
Utku Kemiktarak, Michael Metcalfe, Mathieu Durand, John R. Lawall
We demonstrate micromechanical reflectors with a reflectivity as large as 99.4% and a mechanical quality factor Q as large as 7.8 x 10^5 for optomechanical applications. The reflectors are silicon nitride membranes patterned with sub-wavelength grating

Experimental Study of the Three Dimensional Internal Structure of Underventilated Compartment Fires in an ISO 9705 Room.

February 8, 2012
Author(s)
Kelly M. Opert, Andrew J. Lock, Matthew F. Bundy, Erik L. Johnsson, Cheolhong Hwang, Anthony P. Hamins, Stephen P. Fuss, Ki-Yong Lee
This report documents a set of 9 full scale ISO 9705 room under-ventilated compartment fire experiments for the purpose of guiding the development of the National Institute of Standards and Technology (NIST) computer fire model - Fire Dynamics Simulator

Low Energy Spin Dynamics in the Spin Ice, Ho 2 Sn 2 O 7

February 8, 2012
Author(s)
G. Ehlers, A. Huq, S. O. Diallo, C. Adriano, K. C. Rule, A. L. Cornelius, P. Fouquet, P. G. Pagliuso, Jason S. Gardner
The magnetic properties of Ho 2Sn 2O 7 have been investigated and compared to other spin ice compounds. Although the lattice has expanded by 3% relative to the better studied Ho 2Ti 2O 7 spin ice, no significant changes were observed in the high

Using Truncated Data Sets in Spherical Scanning Antenna Measurements

February 8, 2012
Author(s)
Ronald C. Wittmann, Carl F. Stubenrauch, Michael H. Francis
We discuss the mitigation of truncation errors in spherical scanning measurements. The main emphasis is the spherical harmonic representation of probe transmitting and receiving functions; however, our method is applicable to near-field measurement of

A New Generation of Grain Moisture Meters

February 6, 2012
Author(s)
Gloria D. Lee
One of the current technologies used in the commercial determination of grain moisture is dielectric technology, a technology that has been used for over 60 years. Although this technology has some inherent limitations, meter moisture determination has

A High-Resolution Atlas of Uranium-Neon in the H Band

February 3, 2012
Author(s)
Scott A. Diddams, Stephen L. Redman, Gabriel G. Ycas, Ryan Terrien, Suvrath Mahadevan, Lawrence W. Ramsey, Chad F. Bender, Steve Osterman, Franklyn J. Quinlan, James E. Lawler, Gillian Nave
The rapid advance in near-infrared (NIR) detector technology in the past decade has lead to a number of high-resolution astronomical spectrometers that are either in operation or in the planning stages. Precision wavelength calibration techniques

Annual Report to Sponsor: Understanding Unwanted Combustion Enhancement by Potential Halon Replacements

February 3, 2012
Author(s)
Gregory T. Linteris, Jeffrey A. Manion, Donald R. Burgess Jr., Iftikhar A. Awan, Peter B. Sunderland, John L. Pagliaro
This year, we continued work to numerically model the behavior of the Halon replacements in the FAA Aerosol Can Test (FAA-ACT) to understand why they are causing more overpressure rather than flame extinction. The goal is to understand the process to
Displaying 43426 - 43450 of 143727
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